Roll winder

A winder suitable for winding plastic film in the absence of a winding core comprising a pair of axially aligned arbors, one protruding from each of two opposed side supports of the winder machine, the arbors moveable axially toward each other to a winding position and moveable away axially from each other for stripping from the wound roll, and means for introducing and maintaining pressurized air at the roll-engaged support surfaces of said arbors during said outward stripping movement of said arbors, as the arbors disengage the opposite ends of the roll, said machine including a dependent drive means for driving each of said arbors dependently in said axial stripping motion, wherein the outer ends of said arbors have formations adapted to be engaged by axial drive devices, said arbors being indexable about a central major axis from winding position to discharge position, said drive means adapted to receive said formations on said arbors during said indexing, to apply axial stripping force and subsequent axial return force to said arbors and to release said arbors during subsequent indexing motion from the release to the drive position.

A winder suitable for winding plastic film in the absence of a winding core comprising a pair of axially aligned arbors, one protruding from each of two opposed side supports of the winder machine, the arbors moveable axially toward each other to a winding position and moveable away axially from each other for stripping from the wound roll, and means for introducing and maintaining pressurized air at the roll-engaged support surfaces of said arbors during said outward stripping movement of said arbors, as the arbors disengage the opposite ends of the roll, wherein axially extending flats are provided on each of said arbors and rollers engage said flats in supporting and rotatable driving relation thereto.

A winder suitable for winding plastic film in the absence of a winding core comprising a pair of axially aligned arbors, one protruding from each of two opposed side supports of the winder machine, the arbors moveable axially toward each other to a winding position and moveable away axially from each other for stripping from the wound roll, and means for introducing and maintaining pressurized air at the roll-engaged support surfaces of said arbors during said outward stripping movement of said arbors, as the arbors disengage the opposite ends of the roll, wherein the means for introducing air comprises a piston responsive to air pressure to be resiliently urged against the end of a said arbor and a relief valve operable by said air pressure for admitting air through said piston when said piston is engaged upon said arbor, said arbor having a passage for introducing said air to said arbor surface.

In a winder suitable for winding a web in the absence of a core, comprising arbor means, means for introducing air to the surface of the arbor, means for facilitating sliding of a roll produced on the arbor, and means engaging the roll for producing stripping motion of the roll relative to the arbor, the improvement comprising means localizing the introduction of the air along the length of the arbor through entry means defining substantially equal length flow paths between the roll and the arbor in each direction from the point of introduction of air to each end of the roll, until the roll leaves the arbor.